ATmega1281 Atmel Corporation, ATmega1281 Datasheet - Page 229
ATmega1281
Manufacturer Part Number
ATmega1281
Description
Manufacturer
Atmel Corporation
Specifications of ATmega1281
Flash (kbytes)
128 Kbytes
Pin Count
64
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
54
Ext Interrupts
17
Usb Speed
No
Usb Interface
No
Spi
3
Twi (i2c)
1
Uart
2
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
8
Eeprom (bytes)
4096
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8 to 5.5
Operating Voltage (vcc)
1.8 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
6
Output Compare Channels
16
Input Capture Channels
2
Pwm Channels
8
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATmega1281-8MC
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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Table 22-10. Examples of UBRRn Settings for Commonly Used Oscillator Frequencies
2549N–AVR–05/11
Max.
115.2K
230.4K
14.4K
19.2K
28.8K
38.4K
57.6K
76.8K
Baud
(bps)
250K
Rate
2400
4800
9600
0.5M
1M
(1)
UBRR
95
47
23
15
11
7
5
3
2
1
0
0
–
–
230.4Kbps
U2Xn = 0
f
osc
-7.8%
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
–
–
= 3.6864MHz
Note:
UBRR
191
95
47
31
23
15
11
7
5
3
1
1
0
–
460.8Kbps
U2Xn = 1
1. UBRR = 0, Error = 0.0%
-7.8%
-7.8%
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
–
UBRR
103
51
25
16
12
8
6
3
2
1
0
0
–
–
U2Xn = 0
250Kbps
f
ATmega640/1280/1281/2560/2561
-3.5%
-7.0%
osc
Error
0.2%
0.2%
0.2%
2.1%
0.2%
8.5%
8.5%
8.5%
8.5%
0.0%
–
–
= 4.0000MHz
UBRR
207
103
51
34
25
16
12
8
6
3
1
1
0
–
U2Xn = 1
0.5Mbps
-0.8%
-3.5%
-7.0%
Error
0.2%
0.2%
2.1%
0.2%
8.5%
8.5%
0.0%
0.2%
0.2%
0.0%
–
UBRR
191
95
47
31
23
15
11
7
5
3
1
1
0
–
460.8Kbps
U2Xn = 0
f
-7.8%
-7.8%
osc
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
–
= 7.3728MHz
UBRR
383
191
95
63
47
31
23
15
11
7
3
3
1
0
921.6Kbps
U2Xn = 1
-7.8%
-7.8%
-7.8%
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
229
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